System for party-lines in telephone-exchanges.



E PATENTED JULY 2, 1901..

APPLIOATNN FILED APR. 25.1006.

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No. 858,767. PATENTED JULYLZ, 1907.

E J. M. STORKERSON'.

SYSTEM FOR PARTY LINES IN TELEPHONE EXGHANGES.

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JULIUS M. STORKERSON, OF LA OROSSE, WISCONSIN.

SYSTEM FOR PARTY-LINES IN TELEPHONE-EXCHANGES.

I Specification of Letters Patent.

Patented July 2, 1907.

Application filed April 25, 1906. erial No. 313,549.

By my invention, I divide the subscribers connected with any party lineinto two groups, the selection of a group on any line being determinedby plugging into either one of two jacks, and then the selection betweenthe different stations of the group after having plugged into the jackis accomplished by the operation of ringing keys adapted to send to theline a current of proper character or a proper combination of currentsto ring the desired signal bell, to the exclusion of all the others.

In my invention as herein illustrated and described, I show a system ofoperating party-lines from a twowire multiple, common-batteryswitchboard, the sys tem being applicable to many of the existing typesof party-line or so-called selective bells, the novelty of my inventionresiding in the manner in which such bellsare connected at thesubstation equipments, and in the manner in which the lines servingthose substations are connected and operated at the central officeswitchboard. My system is equally applicable to a three-wire multipleswitchboard.

Two figures accompany this description, in which,

Figure 1 shows the circuits of the substation telephones, line, multiplejacks, relays, and answering jack, and Fig. 2 shows the circuits of atypical cord-pair.

The substation telephones of Fig. l are similar in their telephonicspeech-transmission elements, but differ in their signal-receivingelements, the differences being of two kinds, first in the nature of theringer or call-receiving device itself, and second in the manner inwhich that device is connected to the telephone line. In a line wherebut two substation telephones are served, the first difference may bedispensed with, the call-receiving devices being alike, but differentlyconnected.

The call-receiving devices, 10, 30, 50, 70, at stations 1, 3, 5, 7,differ from each other and may so differ among themselves as to conformto any known method of selective signaling over a single path; aharmonic system of selective signaling is shown, the differences in thedevices being indicated by the difference in the size of the tapperattached to the armature of the ringer; inthis system, the four devices,10, 30, 50, 70, all receive current from a ringing generator, such as 10when such a generator is connected between the line limb 11 and earth,but only one of the devices will produce a signal in response to thegenerator current,

that device responding to the current being the one which is attuned tothe frequency of the generator so connected; other generators areemployed to cause the response of other signaling devices, thedifference in the generators being the speed of alternation of theringing current, the differences of speeds in the ringing currents beingdirectly proportioned to the tuning of the different devices to besignaled. Four such generators are shown, at 10, 30, 50, 70, thegenerator 10 being adapted to signal the devices 10 and 20, the generator 30 being adapted to signal the devices 30 and 40, thegenerator 50being adapted to signal the devices 50'and 60, and the generator 70being adapted to signal the devices 70 and 80.

Of the call-receiving devices, there are connected between the line limb9 and ground one for each of the generators, 10, 30, 50, 70, and betweenthe line limb 11 and ground a similar set of call-receiving devicesforthe same ringing generators.

The line limbs 9 and 11 connect the substation telephone equipments tothecentral office, where they terminate upon the two armatures ofcut-off relay 16, thence being extended by the back contacts of thosearmatures to the armatures of cut-off relay 12; it will be noted that inthis connection between the two cutoff relays the line conductors arereversed, or twisted the conductor from the back contact of the lefthandarmature of relay 16 being connected to the righthand armature of relay12, and the conductor from the back contact of the righthand armature ofrelay 16 being connected to lefthand armature of relay 12. Thus, with apredetermined order of connection between the limbs ofthe line and thefirst relay, there would result a reversed order of connection betweenthe limbs of the line and the second relay.

From the inner contacts of the armatures of the relay 16, two conductorsextend through the multiple switchboard, the inner contact of therighthand armature of relay 16 being connected to the bodies of a seriesof multiple jacks, 15, 15, 15, and being connected also to the body ofan answering jack, 15 although the latter jack is not necessary in mysystem; the inner contact I of the lefthand armature of relay 16 isconnected to the springs of those jacks. From the inner contacts of thearmatures of relay 12, two conductors extend through the multipleswitchboard, the niner contact of the righthand armature of relay 12being connected to the bodies of a series of multiple jacks, 14, 14, 14,and being connected also to the body of the answering jack, 14,associated with a calling lamp, 17; the inner contact of the lefthandarmature of relay 12 is connected to the springs of those jacks.

It will be noted that from the bodies of jacks 14, circuit extendsthrough the winding of relay 12 to earth, and that when that relay isoperated circuit also extends from the bodies of jacks 14 to line limb11, while circuit extends from the springs of those jacks to line limb9. It will be noted also that from the bodies of jacks 15 circuitextends through the winding of relay 16 and thence through the windingof relay 12 in se ries with the winding of relay 16 and to earth, andthat when relay 16 is operated circuit also extends from the bodies ofjacks 15 to the line limb 9, while circuit also extends from the springsof those jacks to line limb 11; with the operation of relay 16 bycurrent received over a circuit from the body of one of the jacks 15,some energization of the core of relay 12 will occur, but the circuitsfrom the jack elements to the line limbs will exist, regardless ofwhether the energization of the core of relay 12 is sufficient tooperate its armatures, or not.

Removing any receiver from its hook when no plug is in any jack willenergize the line relay 13, causing the lamp 17 to glow as a signal; bythe insertion into any of the jacks, but presumably into jack 14,because it is associated with the lamp 17 of a plug 23, giving currentto ground from the body of the jack, one or both of the cut-off relays,12 and 1.6, will be operated, and the circuits of the line relay 13 willbe broken, extinguishing the lamp 17, all in a manner quite usual in theart.

In Fig. 2 is shown a cord-pair of well known type, which is equippedwith four ringing keys, 18, 19, 21, 22, the operation of any one ofwhich will connect the body of the ringing plug 24 with a groundedbattery and the tip of the ringing plug 24 with the associated one ofthe ringing generators, 10, 30, 50,

In calling any of the substation telephones, in Fig. 1, the ringing plug24 and the ringing keys, 18, 19, 21, 22, are used as follows, it beingborne in mind that so far as the telephone operator is concerned, thejacks 14, 14, 14, and the jacks 15, 15, 15, pertain to different lines:Substation 1, ring line 14 key 18, generator 10; station 2, ring line 15key 18, generator 10; station 3, ring line 14 key 19, generator 30;station 4, ring line 15 key 19, generator 30; station 5, ring line 14key 21, generator 50 station 6, ring line 15 key 21, generator 50;station 7, ring line 14, key 22, generator 70; station 8, ring line 15key 22, generator 70.

Tracing the current for ringing station 1, with plug 24 in any jack 14,we find circuit from earth, through generator 10, key 18, tip of plug24, spring of jack 14, conductor 25 of the switchboard cabling, contactof relay 12 operated, contact of relay 16 not operated, line limb 9,ringing device 10 and earth, relay 12 is held operated meanwhile bycircuit from earth through battery 29, conductor 31, coil 32, key 18,body of plug 24, body of jack 14, switchboard cable conductor 26,winding of relay 12, and earth.

Tracing the current forringing station 2, with plug 24 in any jack 15,we find circuit from earth, through generator 10, key 18, tip of plug24, spring of jack 15, switchboard cable conductor 27, inner contact ofrelay 16 operated, line limb 11, ringing device 20, and earth; relay 16is held operated meanwhile by circuit from earth through battery 29,conductor 31, coil 32, key 18, body of plug 24, switchboard cableconductor 28, winding of relay 16, winding of relay 12, and earth.

It will be noted that if the party line had but two substations, saystations 1 and 2, the two telephones would be rung selectively with butone ringing key and with but one ringing generator, a special selectivebell not being required, and the entire selection of substationsdepcnding upon the selection of the proper jackby the operator; the twoseries of jacks in the multiple therefore would bear the directorynumbers of the two substations upon the line, and the operation ofringing those stations so far as the work of the switchboard operator isconcerned would be identical with the work of ringing independenttelephone lines.

The busy test condition required by-the cord pair of Fig. 2 is that thejack of a busy line shall have a potential above the earth by whichcurrent may flow from jack body through plug tip and to earth whentesting. This is provided for in the following manner: With a plug injack 14, current flows from the body of the plug to conductor 26 andthrough relay ]2 to earth, whence test is made directly upon conductor26 by jacks 14, and test is made by jacks 15 to (enductor 28 and thencethrough the winding of relay 16 to conductor 26. With a plug in jack 15,current flows from the body of the plug through conductor 28, winding ofrelay 16 and winding of relay 12 to earth, jacks 15 testing directlyupon the conductor 28, and jacks 14 testing upon conductor 26 which nowgives a busy test due to the fall of potential upon the winding of therelay 12.

I do not wish to limit myself in all respects to the exact circuits,details and description here given, as

I understand that many modifications might be made Without departingfrom the spirit or scope of my invention.

Having thus described my invention, what I. claim as new and desire tosecure by United States Letters Patent is:

1. In a telephone system, a telephone line; a plurality of series ofmultiple jacks; a relay; :1 second relay; and signal-receiving means;said first relay having contacts adapted to connect said line to saidsecond relay. said second relay having contacts adapted to connect: saidline to said signal-receiving means, said first relay having con tactsadapted to connect said line to one of said series of multiple jacks,and said second relay having contacts adapted to connect said line toanother of said series of multiple jacks, substantially as described.

2. In a telephone system, a telephone line; a plurality of series ofmultiple jacks; and two relays associated with said telephoneline, oneof said relays having contacts adapted to connect said line to saidsecond relay and hav ing contacts adapted to connect said line to one ofsaid series of multiple jacks, and the other oi said relays havingcontacts adapted to connect said line to another of said series ofmultiple jacks, substantially as described.

3. In a telephone system, :1 telephone line; a plurality of series ofmultiple jacks; a relay; a second relay; and signal-receiving means;said first relay having, contacts adapted to connect said linealternatiwly to one of said series of multiple jacks or to said secondrelay. and said second relay having contacts adapted to connect saidliuc alternatively to another of said series of multiple jacks or tosaid signal-receiving means, substantially as described.

4. In a telephone system, a telephone line; a plurality of series ofmultiple jacks; and two relays; one of said relays having contacts toconnect said line alternatively to one of said series of multiple'jacltsor to the other of said two relays, and the other of said two relayshaving contacts adapted to connect said line to another of. said seriesof multiple jacks, substantially as described.

5. In a telephone system, a telephone line; a plurality of series ofmultiple jacks; :1 relay associated with said line and with one 01' saidseries of multiple jacks and adapted when actuated to connect one ofsaid series of multiple jacks to said telephone line; and a second relayassociated with said telephone line and with another one of said seriesof multiple jacks and adapted when actuated to connect its associatedseries of multiple jacks with said telephone line, substantially asdescribed.

6. In a telephone system, a telephone line; a plurality of series ofmultiple jacks all, normally disconnected from said telephone line; arelay associated with said telephone line and with one of said series ofmultiple jacks and adapted when actuated to connect said series ofmultiple jacks to said telephone line; and a second relay associatedwith said telephone line and with another of said series of multiplejacks and adapted when actuated to connect its associated series ofmultiple jacks with said tele phone line, substantially as described.

7. In a telephone system, a telephone line; a plurality of series ofmultiple jacks; a relay associated with said telephone line and with oneof said series of multiple jacks and adapted to be actuated when one ofits associated jacks is connected with and adapted when actuated toconnect its said associated series of multiple jacks to said telephoneline; and a second relay associated with said telephone line and withanother of said series of multiple jacks and adapted to be actuated whenone of its associ ated jacks is connected with and adapted when actuatedto connect its said associated series of multiple jacks with saidtelephone line, substantially as described.

8. In a telephone system, a telephone line; a plurality of series ofmultiple jacks all normally disconnected from said telephone line; arelay associated with said telephone line and with one of said series ofmultiple jacks and adapted to be actuated when one of its associatedjacks is connected with and adapted when actuated to connect itsassociated series of multiple jacks to said telephone line; and a secondrelay associated with said telephone line and with another of saidseries of multiple jacks and adapted to be actuated when one of itsassociated jacks is connected with and adapted when actuated to connectits said associated series of multiple jacks to said telephone line,substantially as described.

9. In a telephone system, a telephone line; a plurality of series ofmultiple jacks; signal-receiving means; and two relays, one of saidrelays being associated with said telephone line and with one of saidseries of multiple jacks and adapted to be actuated when one of itsassociated jacks is connected with and adapted when actuated'to connectits said associated series of multiple jacks to said telephone line andadapted when not actuated to connect said telephone line to the other ofsaid two relays, and the other of said relays being associated with saidtelephone line and with another of said series of multiple jacks andadapted to be actuated when one of its associated jacks is connectedwith and adapted when actuated to connect its said associated series ofmultiple jacks to said telephone line and adapted when not actuated toconnect said telephone line to said signahreceiving means, substantiallyas described.

10. In a telephone system; a plurality of series of multiple jacks; arelay; a second relay; signal-receiving means; and a telephone linenormally connected to contacts of said first relay, to contacts of saidsecond relay and to said signal-receiving means; said first relay havingcontacts adapted to connect said line to one of said series of multiplejacks, and said second relay having contacts adapted to connect saidline to another of said series of multiple jacks, substantially asdescribed.

11. In a telephone system, a telephone line; a plurality of series ofmultiple jacks a relay a second relay signal receiving means; said firstrelay haying contacts adapted to connect said line alternatively to oneof said series of multiple jacks or to said second relay, and saidsecond relay having contacts adapted to connect said line alternativelyto another of said series of multiple jacks or to said signal-receivingmeans; and means for operating said second relay independently of saidfirst relay, substantially as described.

12. In a telephone system, a telephone line of two limbs; a plurality ofseries of multiple jacks; a relay, and a second relay said first relayhaving contacts adapted to connect said line limbs to one of said seriesof multiple jacks with a predetermined order of connection between theline limbs and the jack parts, and said second relay having contactsadapted to connect said line limbs to another of said series of multiplejacks with an order of connection between the line limbs and the jackparts the re verse of the order determined for said first relaysoperation, substantially as described.

13. In a telephone system, a telephone line of two limbs; a plurality ofseries of multiple jacks; a relay; a second relay; said first relayhaving contacts adapted to connect said line limbs to one of said seriesof multiple jacks with a predetermined order of connection between theline limbs and the jack parts, and said second relay having contactsadapted to connect said line limbs to another of said series of multiplejacks with an order of connection between the line limbs and the jackparts the reverse of the order determined for said first relays operation; a switch plug adapted toconnect with any of said multiple jacks;means for operating said first relay when said switch plug is connectedwith one of said first series of multiple jacks; and means for operatingsaid second relay when said switch plug is connected to one of saidsecond series of multiple jacks, substantially as described.

14. In a telephone system, two series of multiple jacks; two cut-offrelays; a circuit extending from the bodies of the jacks of one of saidseries of multiple jacks to and through the winding of one of saidcut-oft relays and to earth; and another circuit extending from thebodies of the jacks of the other of said two series of multiple jacks toand through the winding of the second of said cut-off relays and thenceto and through the winding of said first of said cut-oft relays and toearth, whereby a connecting plug inserted in a jack of either series ofmultiple jacks will give busy test upon the jacks of both series,substantially as described.

15. In a telephone system, a telephone line of two limbs; two cut-offrelays associated with said line; connections between said line and thefirst of said cut-off relays; connections between said line and thesecond of said cutoif relays; two series of multiple jacks; connectionsbetween said first cut-oft relay and one of said series of multiplejacks; connections between said second cut-0E relay and the secondseries of said series of multiple jacks; the connections between therelays and the mul tiple jacks being homologous for both relays and theconnections between the line limbs and the second relay being thereverse of the connection between the line limbs and the first relay,substantially as described.

Signed by me at La Crosse, county of La Crosse and State of Wisconsin,this 21 day of April, 1007.

JULIUS M. STORKERSON.

Witnesses L. W. GosNnLn, M. K. RICHMOND.

